Question 1

Which S3 storage class is designed for data that is accessed less than once a month and requires millisecond retrieval, but charges a retrieval fee?

Accepted Answer

S3 Standard-IA (Infrequent Access). It offers low per-GB storage cost with millisecond access but charges a per-GB retrieval fee and has a 30-day minimum storage duration.

Question 2

What is the minimum storage duration charge for objects stored in S3 Glacier Flexible Retrieval?

Accepted Answer

90 days. Objects deleted, overwritten, or transitioned before 90 days incur a pro-rated charge for the remaining days.

Question 3

Which S3 storage class automatically moves objects between access tiers based on changing access patterns with no retrieval fees?

Accepted Answer

S3 Intelligent-Tiering. It monitors access patterns and moves objects between frequent, infrequent, and archive tiers automatically, charging a small monthly monitoring fee per object.

Question 4

What key tradeoff does S3 One Zone-IA have compared to S3 Standard-IA?

Accepted Answer

S3 One Zone-IA stores data in only one Availability Zone, making it 20% cheaper than Standard-IA but vulnerable to data loss if that AZ is destroyed. Standard-IA replicates across a minimum of three AZs.

Question 5

Which S3 Glacier retrieval option provides access to archived data within 1–5 minutes?

Accepted Answer

Expedited retrieval in S3 Glacier Flexible Retrieval. It is the fastest option but the most expensive, suitable for urgent small archive requests.

AWS S3 & Storage – Solutions Architect Associate

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